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#include "io.h" int main(void) { long long rd, rs, rt; long long res; rs = 0x1234567887654321; rt = 0xabcdef9812345678; res = 0x87654321abcdef98; __asm ("packrl.pw %0, %1, %2\n\t" : "=r"(rd) : "r"(rs), "r"(rt) ); if (rd != res) { printf("packrl.pw error\n"); return -1; } return 0; }